-- This is part of LazyVim's code, with my modifications.
-- See: https://github.com/LazyVim/LazyVim/blob/main/lua/lazyvim/plugins/linting.lua

return {
	{
		'mfussenegger/nvim-lint',
		event = 'LazyFile',
		opts = {
			-- Event to trigger linters
			events = { 'BufWritePost', 'BufReadPost', 'InsertLeave' },
			linters_by_ft = {
				fish = { 'fish' },
				-- Use the "*" filetype to run linters on all filetypes.
				-- ['*'] = { 'global linter' },
				-- Use the "_" filetype to run linters on filetypes that don't have other linters configured.
				-- ['_'] = { 'fallback linter' },
			},
			-- LazyVim extension to easily override linter options
			-- or add custom linters.
			---@type table<string,table>
			linters = {
				-- -- Example of using selene only when a selene.toml file is present
				-- selene = {
				--   -- `condition` is another LazyVim extension that allows you to
				--   -- dynamically enable/disable linters based on the context.
				--   condition = function(ctx)
				--     return vim.fs.find({ "selene.toml" }, { path = ctx.filename, upward = true })[1]
				--   end,
				-- },
			},
		},
		config = function(_, opts)
			local Util = require('lazyvim.util')

			local M = {}

			local lint = require('lint')
			for name, linter in pairs(opts.linters) do
				if type(linter) == 'table' and type(lint.linters[name]) == 'table' then
					lint.linters[name] =
						vim.tbl_deep_extend('force', lint.linters[name], linter)
				else
					lint.linters[name] = linter
				end
			end
			lint.linters_by_ft = opts.linters_by_ft

			function M.debounce(ms, fn)
				local timer = vim.loop.new_timer()
				return function(...)
					local argv = { ... }
					timer:start(ms, 0, function()
						timer:stop()
						vim.schedule_wrap(fn)(unpack(argv))
					end)
				end
			end

			function M.lint()
				-- Use nvim-lint's logic first:
				-- * checks if linters exist for the full filetype first
				-- * otherwise will split filetype by "." and add all those linters
				-- * this differs from conform.nvim which only uses the first filetype that has a formatter
				local names = lint._resolve_linter_by_ft(vim.bo.filetype)

				-- Add fallback linters.
				if #names == 0 then
					vim.list_extend(names, lint.linters_by_ft['_'] or {})
				end

				-- Add global linters.
				vim.list_extend(names, lint.linters_by_ft['*'] or {})

				-- Filter out linters that don't exist or don't match the condition.
				local ctx = { filename = vim.api.nvim_buf_get_name(0) }
				ctx.dirname = vim.fn.fnamemodify(ctx.filename, ':h')
				names = vim.tbl_filter(function(name)
					local linter = lint.linters[name]
					if not linter then
						Util.warn('Linter not found: ' .. name, { title = 'nvim-lint' })
					end
					return linter
						and not (
							type(linter) == 'table'
							and linter.condition
							and not linter.condition(ctx)
						)
				end, names)

				-- Run linters.
				if #names > 0 then
					lint.try_lint(names)
				end
			end

			vim.api.nvim_create_autocmd(opts.events, {
				group = vim.api.nvim_create_augroup('nvim-lint', { clear = true }),
				callback = M.debounce(100, M.lint),
			})
		end,
	},
}
